But Why?

Post: SEO
What actually they do?
1. Posts jokes and some (not sure, maybe) awareness on every possible social sites
2. Busy on gadgets (really don’t know for WHAT!)
3. Uses “tools”, this tool, that tool [other than (the main) brain] for what? (that’s the good question)
4. And somehow still they manages to make money well (don’t know Some-Which-What-How)